Electric pump-governor.



W. V. TURNER.

ELECTRIC PUMP GOVERNOR.

APPLICATION FILED APR. 10, 1909.

1,071,830, Patented Sept. 2, 15513.

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wmuesses v COLUMBIA PLANOGRAPH cuv WASHINGTON. n. c

WALTER v. TURNER, OF EDGEWOOD,

HOUSE AIR BRAKE COMPANY, 0]? or PENNSYLVANIA.

PENNSYLVANIA, ASSIGNOR TO THE WESTING- PITTSBURGH, PENNSYLVANIA, ACORPORATION ELECTRIC PUMP-GOVERNOR.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed April 10, 1909. Serial No. 489,093.

To all whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States,residing at Edgewood, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements in ElectricPump- Governors, of which the following is a specification.

This invention relates to pressure governors, and more particularly to apump governor of the type adapted for operating an electric switch, tocontrol the circuit of an electric pump motor.

My invention is designed moreespecially to provide an improved electricpump governor capable of handling heavy currents and low voltages, suchfor instance, as met with in single phase electric installations.

One feature of my improvements contemplates the provision of means forefi'ecting a quick snap-like cutting 'in' action of the switch, so as toprevent the formation of destructive arcs such as are'otherwise liableto be produced when the switchfcontacts are brought together, especiallywhere heavy currents and low voltages-are'employed;

. Another object of my invention isto provide means for causing theplace of contact between the contact members of the switch to be shiftedfrom the'portions of said' con} tact members at first engaging, to otherortions thereof, for the purpose of aflordin clean, smoothcontactsurfaces for the fina contact, thereby obviating the tendency toform a poor connection at the switch due to pitting or roughness of thecontact finger ends caused by fusing or burning.

Another object of my invention is to provide means for maintaining aheavy pressure between the switch contact members, when in engagement,so as to improve the conductivity and effectiveness of the switchconnection.

' Another object of my invention is to provide a pump governor ofgenerally improved construction.

Other features of importance will be referred to in the more detaileddescription of the invent-ion.

In the accompanying drawing; Figure 1 is a vertical section of anelectric pump governor embodying my improvements; Fig. 2

a fragmentary sectional View of a portion of the electric switchmechanism, partly broken away, to show the spring device for the lowercontact member; Fig. 3 a fragmentary elevational view of a portion ofthe switch mechanism, with the upper contact member removed; and Fig. 4a view similar to Fig. 2, showin the relative position of the switchparts w en the contacts are separated.

As illustrated in Fig. 1 of the drawing, the governor may comprise acasing 1 havmg a cylindrical chamber containing a piston'2 whichdividesthe chamber into an upper chamber 3 and a' lower chamber 4. Thegovernorfalso comprises a valve casing 5 having a. chamber containing amovable abutment provided withftwo piston heads 6 and 7 operatingrespectively in piston cham' bers 8 and 9. 'The valve chamber 10intermediate the heads 6 and? contains a main slidevalvei 'll and'an'auxiliaryslide valve 12, mounted on 'thejmainjslide valve and havin"a movement relative thereto.

high tension'regulatin'g device com rismg a; I iaphragm 13,'subje,ct onone si eto pump"p'ressure"and on the pressure of an adjustable spring14, operatesl'a "release valve 15 for releasing air from thecl iambe'rfi at the outer face of pis ton a lovtr' p'ressure regulatingdevice comprising. a diaphragm 16 subject on one side tapqmp pressureand on the opposite 'side to the pressure of an adjustable spring'17operates a valve 18 for releasing air from piston'chamber 9 atthe outer face of pistod head 7. I

According to my improvements, the switch piston '2is' provided with acentral diiterential'piston head'19 operating in a piston chamber 20.The" piston chamber 4 communicates with a port 21, leading to the seatof the'main valve 11 and piston chamber 2 0 communicates with a passage22 having port openings 23 into the piston chamber 3. The chamber 3'isprovided with an atmospheric port 24 and'piston 2 is subject'to thepressure of two springs 25 and 26 contained in the chamber 3 and tendingto move said piston to its inner position.

Piston rod 27 of the piston 2 carries a pivotally mounted lever 28 uponits outer end, suitably insulated from the piston rod and having one endprovided with a contact member 29, the opposite end thereof beingslotted for a fulcrum pin 30 mounted in a suitable bracket 31.

The other contact member the opposite side to,

32, of the lide val veil 6 Iaf bI v the pump motorcircuitithro switch,is secured to a pivoted arm 33,

mounted between standards 34 ofta' bracket-i 35,-so as to have.avertical mov'ementfil A spring rod 36, subject to the pressure of a coilspring 37 is pivotally attache d to 'fli arm 33 and tends to force thearm and-its contact inan upward directionf The Tear ,Th a 3312M q i act.membem ifi eiie suitably insulated from the inaihfisiijg'pi governor ad avfl xi leacant i s bri connectssaid ar co d'pp t or'ca;

. cease 44? 1% mg a nozzle45 thr rgh '1ch,a r ;may be di to =q aahave;as; as p e- One .,e, the QP StQ i, a ts; I4 is v j th ni$ s,- f f?- i lfftlr fi in mm i in i th'apa s s li fire si r si h r ste 4 a J Posite m9. id lti tq fiialto the pressure oflair admitt pa -u.

Inloperation, on the innerfifacenofpistonfl members 29 and 32,, as jshown y pump motor then operatesth pump to comfpress air into the storagerese yti1gant1 the valve chamber 10 being in-communication with thereservoir through,passagel48,gthe fluid pressure therein rrsesandf'equalizes around the piston headsQdzirid 7;." The, pressure beingless than thetension of spring 17, the release valve 18 permitted to fopen and fluid in chamber ,9 ventedto "theatmosp'nere, while the valve l5 being closed, the fluid pressure which equalizes around the pistonhead 6 builds up the'pressu'rein chamber 8 and operatesito sl ift themain valve mechanism to its cut-in position, as shown in Fig. 1. In thispositionga' cavity 50 in the main slide valve ll, connects port 21,leading to piston chamber}, waiterhaust port 51, and as piston chamber.20 is open to the atmosphere throughpassage' 22 and ports 23, the fullarea of the piston 2 is now subject to atmospherie pressure/ As the pumppressure increases by o-peration of the pump, the lo'a pressurediaphragm first operates to closethe release Valve 18 and when the pumppressure slightly exceeds the tension of the high pressure spring 14,the diaphragm- 13 operates the release valve l5, '.:and air is-ventedfrom piston chamber 8, through the passage 49; The main operating pistori the reilpon first moves the auxiliary valve 12 so that cavity 52therein connects "a p'ort 53in the main slide valve ll with a -.po rt,54.;; -,Ifort $3 being now in register with port 43 and port 54 beingconnected with a port 55, leading topistoirchamher 3, .communicationisope n edfrom' the piston chamb er' fitdthe blowout piston valve 42,thereby permitting fluid 'under pressure in chamber 8 to tojthe pistonvalve 42 and this fluid atei s g p a en w ereas t l p n. a vent airthrough the blow-out passage 44 on tqthe, switch contacts. The movementof the" main' val'v ej mechanism v is thus accelgiia ed by tlie'lifentingfof fair to the'blow-out Iil 'fii it nii l ejvsat of a fthelease'valve1'5. The continued movement of the grain piston; causes "tl1eshifting of the vallve ,ll -and port 56 therein is into: register withport 21; Air is then fadmittedffromf'the valve chamber 10 to' pist onchamber 4, and acting 9% piston ftorq es the same outwardly. The e e'tjot main'valve'piston also 9P? i i member 29 rises and is followedup-b t he"contactjnember 32, the latter being yieldiri'glymressedupwardly by'the action of the spring 37, so that the contact membersremain in'contact until the stop 38 on .tlie iar'm 33ehgages with thebracketstandaid 34," then thecontac'ts of'courseseparate and break themotor circuit upon the further upward movement of the contact member 29.

the piston 2 passes over one of the port openings 23, so that acommunication is established from chamber 4 to passage 22 and thence topiston chamber 20. Now the port opening of passage 21 into chamber 4 isso restricted thatupon opening the port- 23 to said chamber, the efi'ectis that of opening a 'vent port fromthe chamber, as airfis not suppliedthrough the restricted port 2l fast enough to make up for theincreasedtpiston area open to fluid pressure and consequently thetendency of the piston to'accelerate its speed too rapidly is checked.It should be understood that the piston 2 still moves rapidly' enough toprevent-the formation of arcs as the switch contacts separate, but at QXlittle before the contact members separate,

the same time an excessively rapid' movement is prevented, as suchmovement is unnecessary and tends to cause pound ng and possiblebreakage of-parts. i

The piston valve 42, being subject to the 6 with a differential pistonhead portion 58 adapted to fit snugly within a piston 'cham ber 59. Thispiston chamber 59'communi-j cates with passage 49 leading to the'releasevalt'el5, so 'that whenever said-valve is opened, it will be seen thatthe'pressure' in chamber 59 is quickly reduced substantially toatmospheric pressure, rega-rdless of the.

pressure in chamber 8, thus facilitating the rapid movement of the mainva'lve*p'arts. In the extremecut-out position of the main valve piston,the piston head '6 seats on an annular ring 60, and thus leakage of airfrom the piston chamber 8 and the main reservoir is prevented, duringthe time that the parts remain-in-the cut-out position. In moving to thecut-out position, the pistoii 2 passes over the port 46, and air isadmitted from the piston valve air through the blow-out passage 44. Asthe pump pressure diminishes, the high tension diaphragm first permitsthe valve 15 to close and then when the pressure becomes slightly lessthan the tension of the low pressure spring 17, the release valve 18opens and air is vented from the piston chamber 9, and the main valvemechanism instantly moves to its cut-in posit-ion, connecting theannular space 4 through passage 21 and cavity 50 with exhaust port 51.The venting of air from the space 4 causes the inward movement of piston2, and, passing over the port openings 23, the movement of the piston 2establishes communication from the central piston chamber 20 to theatmospheric port 24. This occurs when the contact 29 has moved to withina short distance of the contact 32, say about one-fourth of an inch, andthereupon, the sudden venting of air from the central piston chamber 20causes the rapid movement of the piston, and thus the contact members ofthe switch are brought together with a quick, snap-like action. As thepiston 2 continues its inward movement, the contact member 29 pressesagainst the contact member 32 and moves the same inwardly against theresistance of the spring 37. The movement of each contact member about adifferent center is such piston chamber 4 to thespring side of thepiston valve 42, thus permittingtho fluid pressures to equalizeonopposite sides. thereof. The spring 47 will then close the 42 andprevent further flow-ofthat the contacts at first engage at the outerend portions,'-as indicated in Fig. 4, and then by a relative sliding orwiping and rolling movement finally assume the cut-in position, asshownin Fig. 1, in which the portions of the switch in contact are somedistance back from the ends. In the cut-in position of the switch, theportion 61 of the switch arm 33 engages the stop 62 and so the pressurebetween the contacts at this time is equal to the pressure of thesprings 25 and '26 less the pressure of. the spring 37, of course takinginto consideration the leverage ofthe switch arm 28. In practice thesprings are preferably made to exert a pressure of about 110 pounds andthe piston stem 27 being'pivoted about midway on the lever 28, the.downward pressure on contact 29 is about 55 pounds. A heavy contactpressure is-thus. produced between the switch contacts when in thecut-in position, insuring'an :eflicient connection of good conductivity.

r It will now be apparent that a pump governor constructed according tomy invention is adapted to effect the quick snap-like action oftheswitch in cutting-in and by shifting the relative place of contact ofthe switch contacts, a smooth, clean contact is insured, all of whichtends to eliminate troubles due to arcing and poor contacts. Though ofspecial utility in connection with theuse of heavy currents and lowvoltages, the construction may,of course, be employed generally withadvantage.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. A pressure governor comprising a controlling device, an actuatingpiston therefor, valve means governed by the pump pressure for supplyingfluid to operate said piston, and means operated by the movement of saidpiston in one direction, for venting fluid from one side of the pistonand by the movement of said piston in the opposite direction forsupplying fluid to one side of the piston.

2. A pressure governor comprising a pump controlling device, anactuating piston therefor having two pressure receiving surfaces, avalve mechanism governed by the pump pressure for varying the fluidpressure on one surface, and means operated by the movement of saidpiston for varying the pressure on the other surface.

3. A pressure governor comprising a pump controlling device, anactuating piston therefor having two pressure receiving surfaces, avalve mechanism governed by the pump pressure for venting fluid from onesurface, and means operated by the piston for venting fluid from theother surface to cause the sudden movement of said controlling the fluidpressure on said actuating piston, a blow-out valve means operated byfluid pressure, and an auxiliary valve having a movement relative tosaid main valve and operated by the preliminary movement of saidabutment for venting fluid under pressure from one face of said abutmentto said blow-out valve: means to operate the same.

6. A pressure governor comprising a controlling switch, an actuatingpiston therefor, valve means and anfabutment having two piston headsfor'controlling the fluid pressure on said actuating piston, a releasevalve device governed bya-thepump pressure for venting fluid from onepiston head, a blow-out valve means for the switch, and means operatedby' -the'movementof said abutment for supplying air from the Copies ofthis patent may be obtained for five cents each; by addressing the I v"Washington, 11. 0; I

other piston head to said blow-out valve means.

7. A pressure governor comprising a controlling switch, therefor, a mainvalve and an abutment having two piston heads for controlling the fluidpressure for operating said actuating piston, a release valve devicegoverned by pump pressure for venting fluid from one piston head, ablow-out valve means for the switch, and an auxiliary valve having amovement relative to the main valve and operated upon preliminarymovement of said abutment for venting fluid from the other piston headto operate said blow-out valve means.

' 8. A pressure governor for pumps comprising a vpump controllingswitch, an actuatingpiston therefor, a valve mechanism for controllingthe fluid pressure on said actuating-"piston, means subject to pumppressure for venting fluid from said valve mechanism, and a blow-outvalve means op erated, by fluid vented from said valve mechanism forsupplying air to said switch. 7 In testimony whereof I have hereunto setmyhandrr a. .u' ,WALTER V. TURNER. 2' Witnesses; v

M. M anr,

M. CLEMENTS.

iii Commissioner of Patents,

an actuating piston

